Internal-combustion engine



L. T. GODFREY-EVANS.

INTERNAL COMBUSTION ENGINE.

APPLICATION men FEB. 9. 192x.

1,414,356. Patnted May 2, 1922.

UNITED STATES:

PATENT OFFICE.

v mwrs rnons eonrnny-nvmsjorwnsr nonwoon; Lennon, ENGLAND.

- mrmNAL-conus'nmtnnem'r.

' Specifimtion of Letters Patent.

em-ran men rm; rnovrsrons brim m or men a, 1921, 4isn'r. L, 1313.

T all whom-"2t may conc'rni V Be it known that I, LEVIS THOMAS Gonmar-Evans, a subject of the King of Great specification. V

- This invention relates to internal combus tion engines of the kind wherein the engine is'governed by the charge of'liquid fuel be Britain and Ireland, and a resident of West Norwood, county of London, England, have 4 such as a ball valve 12.

invented a" certain new and useful Improvee ment in Internal-Combustion Engines, on which I vhave obtained Letters Patent the expansion pressure comprises difieren Great Britain 'No. 29,736, dated November 28, 1919, and of which the following is a ing measured out in accordance with the expansion pressure in the working cylinder. Heretofore, the onl suggestions made for effecting this have ad in viewthe control of the supply of explosive gas to the enginev cylinder; In one case the induced charge passed through a spring-pressed throttle" valve, the spring-pressure onthe valve being augmented by a pressure dependent on the terminal expansion pressure, the number of revolutions and the escape of cylinder gases from or past a hand-regulated throti V tle valve, this being arranged by placing the spring and a piston 'onthe' .valve in a chamto said hand-regulated valve. 7

- ploy a loaded valve, for-example, a springtanks for distributing lubricatingoilto enpressed difierential valve, not for throttling a previously mixed charge, but for displacmg a volume of liquid fuel from its storage receptacle in accordance with a pressure or range. of pressures of the expansion curve,

whereupon this increment of fuel passes to a carburetter to be mixed with air in any desired manner. It is equally applicable to oil gine parts;

e embod ment of the invention is illus-- trated, hy Way of example, in the accom.

panymg' drawing, showing a fuel tank 1, ens

I closed but for an inlet 2 for gaseous fluid above the liquid level and an outlet 3 to the carhuretterof the type shown. for example,

in my co-pending application Serial No.

443646, filed February 9, 1921. The inlet 2' for gaseous fluid is connected through a spring-pressed or equivalently loaded valvev working-cylinder and V m of gas passing into port 9 is roughly According to the present invention, I em plication Serial No. 443644, filed February 9, 1921, at a place whereat this pipe will be subjected to a pressure or' range of pressur'es represented by the expansion curve.

The p'pe 5 maycontain a non-return valve,

[As seen from the figure; the device for measuring out the fuel'in accordance with tial pistons 4, 4' which in action take up;a

position determined bv the compression after the explosion has occurred, theexpan- I sion pressure is transmitted'by the pipe 5 to the intermediate chamber 7. The pressure in the upper chamber 8 will at this'moment be less than in chamber 7 The piston 4therefore rises and uncovers the port 9 in the cylinder wall. 7 Gas will therefore flow into said portand so raise the pressure slightly in the chamber 8 and the; 10 above the liquid level inthefuel-tank .1.-

The pistonl4- is so adjustedlthat -a' very small quantity of gas passes 'intoJ-port' 9. The amount which passes "will" depend on the pressure in the cylinderand which may be visualized by the shape of the expansion "curve, and as the pressure in. chamber 8 is comparatively low, it Twillibe seen; that the in volume to the gas which enters the space 10; consequently, thefuel discharge will be r in. accordance with the expansion pressure or engine load. Y Y

To check the reciprocatory action of the pistons 4, 4', I mayf'provide a damping device such as an oil dashpotll. I aim at the piston 4 remaining, during the operationof the engine, as far as po$ible at'the 4 position wherein its lower face. nearly coincides with the lower edge of port- 9, so that the supply of burnt or partly burnt gas can he instantaneously admittedft'o same.

each explosion in the working chamber of the engine there may thus be injected into port 9,; and therefore space 10, af volume of gas accordance with the pressure in the theen'gme.

cylinder and consequently withithe load 45a 1atented m 2, 1922. Application filed February's, 4921. Serial 170.4483451 "l5 ace '90 discharge of fuel from tankrl will be equal .in the event of the loa ferred to chamber 7 below the piston 4,

because the reduction in pressure in chamher 7 will result in a 'sudden greater difference inthe pressures in chambers 8 and 7, causing the differential piston to drop sufliciently for the gas in chamber 7 to enter chamber 7 by means of said by-pass. The

orifice 10' is a constricted vent, so that the piston 4 becomes balanced and thus restores the differential piston to its normal position.

1. Apparatus for governing internal combustion engines, comprising a spring-controlled diflerential valve, so arranged that a volume of gas determined by a pressure or pressures within the cylinder of the engine at certain points in the expansion curve is .allowed to pass the valve and so displace a.

corresponding volume of liquid fuel from its storage receptacle in order that this fuel may be admitted to the carburetter, substantially as described.

2. A device for governing the supplyof fuel to the carburetor of an internal. combustion engine, including a valve unit having differential pistons therein, a pipe line establishing communication between the combustion chamber of the engine and the space between the differential pistons in the valve, a fuel supply tank havmg' a connection with the carburetor and a pipe line communicating with the fuel supply tank and with the valve casing, said pipe line at its point of communicatlon with the valve casin being controlled by one of the differentia pistons.

In testimony whereofl have aflixed my.

signature hereto this 21st day of January,

' LEWIS THOMAS GODFREY-EVANS. 

